A Mesoporous Rod-like g-C₃N₅ Synthesized by Salt-Guided Strategy: As a Superior Photocatalyst for Degradation of Organic Pollutant

Abstract

Three-dimensional graphite carbon nitride (3D-CN) has received tremendous research interest due to its unique structural features, fascinating physicochemical properties, and widespread potential applications. Most syntheses of 3D-CN mainly focus on developing g-C3N4 (2.7 eV) using soft-templating and hard-templating strategies. Nevertheless, the excellent photocatalytic activity of 3D-CN is related to its small band gap, which is relevant to its structure and the nitrogen (N) content. Meanwhile, it is still a challenge to prepare N-rich CN with special structure and a small band gap using a simple and green strategy. Herein, a novel, mesoporous rod-like and N-rich graphite carbon nitride (RN-g-C3N5) is fabricated by a facile and green KBr-guided approach using 3-amino-1,2,4-triazole. The KBr acting as a guider can be easily removed by water. Surprisingly, the mesoporous rod-like structure makes for the usage of visible light and the enhancement of surface area of RN-g-C3N5. More importantly, the special structure and high N content result in a narrow band gap (1.90 eV). Therefore, RN-g-C3N5 displays notably superior photocatalytic performance. Meanwhile, the RN-g-C3N5 with excellent photocatalytic performance has great prospects in environmental remediation.

Direct Observation of Dynamic Bond Evolution in Single‐Atom Pt/C3N4 Catalysts

“…As compared with the relatively low SI‐DRIFTS spectrum of S‐Pt‐C 3 N 4 under dark conditions, the characteristic peaks were significantly enhanced under light irradiation (Figure C). More specifically, the peak at 821 cm −1 is attributed to the breathing vibration of heptazine rings, and the peak at 1006 cm −1 is indexed to the N−H bending vibration . The broad band at 1200–1700 cm −1 corresponds to the stretching vibration mode of CN heterocycles with peaks positioned at 1697, 1493, and 1341 cm −1 .…”

Recent Progress in Polymorphs of Carbon Nitride: Synthesis, Properties, and Their Applications

“…demonstrated the formation of rod‐shaped C 3 N 5 structures using N‐rich 3‐amino‐1,2,4‐triazole (ATZ) as raw material. [ 13 ] Unlike the Vinu et al. report, this study testified to a higher pyrolysis temperature, for a polymeric C 3 N 5 formation, of 500 °C for 3 h under a static air environment.…”

CxNy: New Carbon Nitride Organic Photocatalysts

“…One of the most applied methods was developed by Zhang, Yan, and co-workers. They prepared a rod-like C 3 N 5 material with a length up to 1-6 µm and a diameter of 100-500 nm through a KBr-guided approach using 3-amino-1,2,4-triazole as C 3 N 5 precursor and KBr acting as guide (Wang et al, 2019). In this method, an aqueous solution containing KBr and the C 3 N 5 precursor was heated at 80 °C, and the water solvent was allowed to gently evaporate until the KBr crystals grew covered by the molecular precursor.…”